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Balun Designs

Model 4935 - 4 & 9:1 Unun, 1-54 MHz, 5kW


Model 4935 - 4 & 9:1 Unun, 1-54 MHz, 5kW

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Product Description

Based on the success of our model 4932, this 5kW configuration is also perfect for matching both long and short length wire antennas for multiband use.  When used with the stated lengths shown in the table below, the 9:1 ratio will allow the internal tuner of most rigs to easily match remotely mounted single wire antennas.  

For additional versatility, the 4:1 ratio will handle any random, non resonant length of wire which can then be matched using an ATU or many internal tuners.  Plus this ratio is commonly used to increase performance of 19, 31 and 43 foot multiband verticals.  Unfortunately, both ratios cannot be used simultaneously.

Due to the proprietary nature of this design, we have elected not to show an image of the internal windings. However, you can be confident the construction is the same high quality as all other units built by Balun Designs.

Installation Notes and Recommended Wire Lengths


Ununs are intended for use with unbalanced antennas such as verticals and long wires. 
They will not work with balanced designs such as dipoles or loops and use with a balanced antenna may cause damage to the unit.



  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
  Core is coated and sealed for long term durability.
  Winding Type   Stacked cores wound with trifilar set configured for use as either 4:1 or 9:1 unun operation.
  Winding Material   14 gauge Superior Essex Heavy build polyamideimide Allex 240 Winding Wire
  Windings are inserted into Teflon tubes increasing total breakdown to 10,000 volts.  
  Power Rating   1 to 54 MHz - 5kW.  
  Useable Frequency   1 to 54 MHz
  Insertion Loss   Less than .02db
  Connectors   SO-239 connectors are silver plated with Teflon insulation.
  Studs and eyebolts are 1/4 inch.
  Alternate connectors and Mounting Options are available in the Accessories section.
  Hardware   All Stainless Steel
  Enclosure Type
  NEMA rated 4x marine grade junction box for outdoor installations.
  Cover utilizes integral neoprene gasket for weatherproof integrity.
 Dimensions  4x4x2 inches for main body of unit
 Dimensional Drawing of Standard Enclosure
 Additional Info  Very high efficiency (98-99%) 
 Will not heat up or saturate at like many of the "less expensive" designs.